US2783146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-hydrotropic chemical lignocellulose pulping process
Assignee: Mckee Dev Corp
•
Filing: 1955-01-07
•
Granted: 1957-02-26
•
Expires: 1975-01-07
Abstract
No abstract record available.
Inventors
- 👤 Ralph H Mckee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:30
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
THE PROCESS FOR PRODUCING A LIGNOCELLULOSE PULP FROM PENTOSAN CONTAINING LIGNOCELLULOSE MATERIAL SAID PULP HAVING SUBSTANTIALLY THE LIGNIUM CONTENT OF THE LIGNOCELLULOSE MATERIAL COMPRISING COOKING SAID STARTING MATERIAL WITH A DILUTE 1 TO 5 PERCENT AQUEOUS SOLUTION OF A HYDROTROPIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF BENZOIC ACID, SALICYLIC ACID, XYLENESULFONIC ACID, CYMENESULFONIC ACID, PHENOLSULFONIC ACID, TOLUENESULFONIC ACID AND THEIR ALKALI METAL SALTS UNTIL A SUBSTANTIAL AMOUNT OF THE PENTOSANS IS REMOVED.
Claim 2
Dependent Claim
73 words
THE PROCESS FOR PRODUCING A LIGNOCELLULOSE PULP FROM PENTOSAN CONTAINING LIGNOCELLULOSE MATERIAL SAID PULP HAVING SUBSTANTIALLY THE LIGNIUM CONTENT OF THE LIGNOCELLULOSE MATERIAL COMPRISING COOKING SAID STARTING MATERIAL WITH A DILUTE 1 TO 5 PERCENT AQUEOUS SOLUTION OF A HYDROTROPIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF BENZOIC ACID, SALICYLIC ACID, XYLENESULFONIC ACID, CYMENESULFONIC ACID, PHENOLSULFONIC ACID, TOLUENESULFONIC ACID AND THEIR ALKALI METAL SALTS UNTIL A SUBSTANTIAL AMOUNT OF THE PENTOSANS IS REMOVED.
References Cited (Backward Citations)
CA461373A
Cited
US1658213A
Cited
US1705424A
Cited
GB271524A
Cited
US1843851A
Cited
US2308564A
Cited
US2287332A
Cited
US2538457A
Cited
US2615883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-26 | 1960-08-27 | 1961-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-26 | 1964-08-27 | 1965-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-26 | 1968-08-27 | 1969-02-26 | $7700.00 | Window Closed / Lapsed |